James tamblyn



@garantia JAMEs TAMBL YN, or vIRGINiA CITY, NEVADA.

Letters Patent No. 84,7 7 8, dated December` 8, 1868.

AUTMATIC STOP FOR MINING-CARS.

The Schedule refened to in these Letters Patent and making part of the same.

To all whom it may concer@ Be it known that I, JAMES TAMBLYN, of Virginia City, in the county of Storey, and State of Nevada, have invented a new -and useful Improvement in Automatic Stops for Mining-Cars; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the saine, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a side view of my invention.

Figure 2 is a plan or top view of' the same.

Similar letters of reference indicate like parts.

The object of this invention is to obtain a simple automatic stop to prevent mining-cars from running into the shaft before the cage is up at ithe mouth or top ofthe shaft to receive the car.

Accidents now frequently occur by cars, with men upon them, being precipitated into an open shaft, and accidents of this kind will be fully obviated by my invention.

In the accompanying sheet of drawings- A A represent the two rails or track of a ruining car, the latter being partially shown in red in g. l.

B represents the topv or mouth of a shaft of the mine; and

C is a lever, placed below the track in a suitable cavity or box, and having its fulcruin at a.

One end of this lever is forked, the two prongs b b of which have the ends of a rod, D, lit-ted in them.

Ou this rod D there are secured, by keys c c, two curved projections, E E, which, when in use, or pervforming the' functions for which they are designed,

pass up through openings d d, in the rails A A, as shown clearly in fig. l. y

The other end of the lever C is connected, by a pivot-bolt, aX, to a lever, F, having its fulcrum at e,

and to the outer end of the lever F, a chain, G, is attached, into which the cage catches 'when fully up, and which chain supports the cage H isia curved spring, the ends of which bear, one against 'the under side of lever G, and the other against the under side of lever F, said springhaving a tendency to keep the projections or stops E in an jelevated position, as will be `fully understood by referring to lig. 1.

It will be seen, from the above description, that a car moving inthe direction indicated by arrow 1, cannot pass into the shaft, the stops E E preventing it.

But when the cage reaches the top or mouth B ofthe shaft, and catches upon the chair G, the weight of the cage will draw down the chain, and elevate the connected ends of the levers C F, and the stops E E will consequently be -drawn down out ofthe way, so that the car may pass into the cage.

Thus, by this very simple means, accidents `caused by the passagerof cars into the shaft, before the cage is up ready to receive them, will'be obviated.

The stops E E may be adjusted on the rod D, ata greater or less distance apart, to'correspond to the position of the rails, or the width of the space between them.

Having thus described my invention,

I clairn as new, and desire to secure by Letters Patent- The projections or stops E E, arranged with the levers G F, and spring H,vconnected with the chain G, and all applied to operate in the manner substantiall y as and for the purpose herein set forth. n

VJAMES TAMBLYN. Witnesses:

THOMAS C. FORD, JAMES HooPnR. 

